Why did Diem popularity plummit?

Answer 1

Diem's popularity plummeted due to a combination of oppressive governance, widespread corruption, and failure to address the needs of the Vietnamese people. His regime's harsh crackdown on dissent, especially against Buddhists, alienated many citizens and sparked significant protests. Additionally, his reliance on U.S. support without fostering genuine national unity led to disillusionment among the populace. Ultimately, his inability to effectively combat the growing influence of the Viet Cong further eroded his legitimacy and support.